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Here is an easy exercise to prove how light HV bullets are on the bore of a rifle and why such a large gain in speed is possible with HV technology. Under NO circumstances should you try to do this test with a conventional smooth bullet or a grooved bullet, unless you know how to deal with a bullet stuck in the bore of a rifle. After a demonstration like the one below, it brings home the vast difference between the ease of moving an HV bullet down the bore of a rifle compared to a smooth bullet or a grooved bullet.

We did this test because we were told that it could not be done. We cleaned a military 7x57 barrel and left it lightly oiled. The procedure below is self explanatory.

Drop the HV bullet into the chamber.
Start the bullet into the throat tapping lightly with a flat punch.
Once it is on it's way down the bore, push it with a copper rod.
Emerging from the muzzle.
All the way out.
Do NOT try this with smooth or grooved bullets unless you know how to deal with a bullet stuck in the bore!

The difference between drive bands and grooves on a bullet

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GS Custom Bullets, situated in Port Elizabeth on the East Coast of South Africa, manufactures solid copper, turned, monolithic bullets for hunting and sport shooting. These bullets are used by hunters on several continents, hunting from the smallest of antelope to the largest of dangerous game, using the smooth HP bullet, as well as the more popular HV, FN and SP bullets with the patented drive band concept. GSC bullets are configured for the highest possible ballistic coefficients. SP bullets are mainly used for sport shooting. All GS Custom Bullets are coated.